Downshifting an automatic transmission involves changing the gear ratio to a lower one, which can result in the engine breaking effect. This can cause the wheels to lock up, leading to a loss of traction and control of the vehicle. On slippery roads, it's important to maintain as much control as possible, and sudden changes in the transmission can be risky.
If you find yourself on a slippery road with an automatic transmission, it is usually better to keep the vehicle in the highest gear that allows you to maintain a steady speed. This will help to reduce the risk of losing control and skidding.
Remember, the primary goal is to maintain smooth, controlled driving to ensure your safety and that of others on the road.
